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  <title>Clear resources associated with a PixelIterator</title>
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  <h1 class="refname">ImagickPixelIterator::clear</h1>
  <p class="verinfo">(PECL imagick 2, PECL imagick 3)</p><p class="refpurpose"><span class="refname">ImagickPixelIterator::clear</span> &mdash; <span class="dc-title">Clear resources associated with a PixelIterator</span></p>

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 <div class="refsect1 description" id="refsect1-imagickpixeliterator.clear-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>ImagickPixelIterator::clear</strong></span>(): <span class="type">bool</span></div>

  <div class="warning"><strong class="warning">警告</strong><p class="simpara">本函数还未编写文档，仅有参数列表。</p></div>
  <p class="para">
   Clear resources associated with a PixelIterator.
  </p>
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 <div class="refsect1 returnvalues" id="refsect1-imagickpixeliterator.clear-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>。
  </p>
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 <div class="refsect1 examples" id="refsect1-imagickpixeliterator.clear-examples">
  <h3 class="title">范例</h3>
  <p class="para">
    <div class="example" id="example-2978">
      <p><strong>示例 #1  <span class="function"><strong>ImagickPixelIterator::clear()</strong></span></strong></p>
      <div class="example-contents">
      <div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">clear</span><span style="color: #007700">(</span><span style="color: #0000BB">$imagePath</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$imagick&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;\</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">(</span><span style="color: #0000BB">realpath</span><span style="color: #007700">(</span><span style="color: #0000BB">$imagePath</span><span style="color: #007700">));<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$imageIterator&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getPixelRegionIterator</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">250</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Loop&nbsp;through&nbsp;pixel&nbsp;rows&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$imageIterator&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$pixels</span><span style="color: #007700">)&nbsp;{&nbsp;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/**&nbsp;@var&nbsp;$pixel&nbsp;\ImagickPixel&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*&nbsp;Loop&nbsp;through&nbsp;the&nbsp;pixels&nbsp;in&nbsp;the&nbsp;row&nbsp;(columns)&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$pixels&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$column&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">$pixel</span><span style="color: #007700">)&nbsp;{&nbsp;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$column&nbsp;</span><span style="color: #007700">%&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Paint&nbsp;every&nbsp;second&nbsp;pixel&nbsp;black*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$pixel</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setColor</span><span style="color: #007700">(</span><span style="color: #DD0000">"rgba(0,&nbsp;0,&nbsp;0,&nbsp;0)"</span><span style="color: #007700">);&nbsp;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Sync&nbsp;the&nbsp;iterator,&nbsp;this&nbsp;is&nbsp;important&nbsp;to&nbsp;do&nbsp;on&nbsp;each&nbsp;iteration&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$imageIterator</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">syncIterator</span><span style="color: #007700">();<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$imageIterator</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">clear</span><span style="color: #007700">();<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Type:&nbsp;image/jpg"</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$imagick</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
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</code></div>
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